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Freedom from vascular complications ;Acute success defined by lesion, device, and procedural success; Freedom from any death, stroke MI (Q, non-Q wave), and from target lesion revascularization at one year [ Time Frame: 1 Year ]

Qualifying non-invasive test (ultrasound or MRA) was performed less than 60 days prior to study entry. Carotid duplex study revealed:

Stenosis > or = to 50% in symptomatic patients

Stenosis > or = to 60% in asymptomatic patients

Target lesion may be in the common or internal carotid artery and is amenable to treatment with angioplasty and stenting

Patients taking warfarin may be included if their dosage is reduced before the procedure to result in an INR of 1.5 or less and a Prothrombin time of 15 seconds. Warfarin may be started after the procedure.

Female patients of childbearing potential must have a documented negative pregnancy test during index hospitalization

Patient or legally authorized representative must sign a written informed consent, prior to the procedure, using a form that is approved by the local institutional review board or medical ethics committee

Exclusion Criteria: (Patients will be excluded from the study if ANY of the following conditions are present)

There is total occlusion of the target carotid artery treatment site.

The patient has an allergy or contraindication to aspirin, ticlopidine, clopidogrel, bivalirudin, nickel, titanium, or a sensitivity to contrast media, which cannot adequately pre-medicated.

The subject has a platlet count< 100,000 cells/mm3 or 700,000 cells/mm3 or a WBC of < 3,000 cells/mm3.

Stroke within 7 days prior to the procedure

NIH stroke score > or = to 15 within 7 days prior to the procedure

The patient has experienced a significant GI bleed within 6 months prior to study procedure

The patient has active internal bleeding

The patient has had major surgery or serious trauma within 6 weeks before enrollment